The Power and Efficiency Analyses of the Cylindrical Cavity Receiver on the Solar Stirling Engine

Abstract

The technique of solar dish and Stirling engine combination is the most challenging and promising one. For the efficient conversion of the externally concentrated heat to the usable power, we studied the influences of the wall temperature, inclination angle, and open area ratio of the receiver on the Stirling engine power and efficiency. The theoretical analysis of the heat exchange element of the solar Stirling engine was performed, and the simulation model of the cavity absorber was built and analyzed. The temperature cloud and heat loss trends of the receiver under different wall temperatures, inclination angles, and opening ratios were illustrated. When the wall temperature of the absorber changes from 700 to 1000 K, the efficiency of the engine has increased by 8.8% from 21.34% to 30.11%. The higher the temperature, the higher the efficiency. As the inclination angle of the absorber increases from 0° to 60°, the efficiency of the engine is increased by 7.7% from 21.1% to 28.8%. With the increases of the aperture ratio, the engine output and efficiency reduced. The engine efficiency at the aperture ratio of 0.5 is 4% larger than that at the aperture ratio of 1.

Analysis and Evaluation of Heat Pipe Efficiency to Reduce Low Emission with the Use of Working Agents R134A, R404A and R407C, R410A

“…Gao et al [24] investigated the use of heat pipes for the decomposition of sulfuric acid based on heat transfer surfaces and catalytic volume, and obtained a near 7% acceleration of the decomposition process due to the intense heat exchange taking place in the heat pipes. Ji-Qiang Li and others [25] investigated the power and efficiency of heat exchange in a Stirling engine where there are high technological requirements in terms of heat exchangers. Taking into account the range of temperatures of the applicability of heat pipes and the results of the efficiency of heat transfer through them, it is possible to suggest the use of heat pipes for their tests.…”

Analytical and numerical analysis of a ring‐array concentrator

“…A Fresnel lens is used to complete the remaining space. Its radius is represented by r fresnel in Equation (9).…”

“…2,3 Fresnel lens concentrators are widely used in photovoltaic technology; however, these lenses have a limited concentration ratio due to their strong chromatic aberration issue. 4,5 The use of high solar flux benefits heatto-electricity conversion by Stirling engines [6][7][8][9] and organic Rankine cycle engines 10 ; direct light-to-material interaction, energetic transition from other non-renewable sources 11 ; high-power solar-pumped lasers [12][13][14][15][16] ; energy heat storage. [17][18][19][20] The existing parabolic mirrors have their own specific characteristics depending on their size and application, as shown in Figure 1.…”

“…This article provides a new insight into RAC architectures that enables not only the improvement in the concentration and efficiency, but also the reduction in the overall size of the concentrator, resulting in an increase in cost‐efficiency. This is highly desirable and suitable for the aforementioned applications 6‐10,12‐20 . Furthermore, with the adoption of the RAC, the negative effect of the receiver's shadows on the performance of the concentrators will no longer be a serious concern for many applications.…”

“…This is highly desirable and suitable for the aforementioned applications. [6][7][8][9][10][12][13][14][15][16][17][18][19][20] Furthermore, with the adoption of the RAC, the negative effect of the receiver's shadows on the performance of the concentrators will no longer be a serious concern for many applications.…”